Based on historical data, Target has a [rt]% expected annual…

Based on historical data, Target has a [rt]% expected annual return and [sdt]% standard deviation while Berkshire Hathaway has a [rb]% expected return and a [sdb]% standard deviation. Assume the correlation between the returns of these companies is [corr]%. What is the expected return of your portfolio if you split your money evenly between Target and Berkshire?